Retaining-valve device



May 1927.

A F. P. LivlNss'roN RETAINING VAPVE DEVICE Filed .July 1v, 1926 INVENTOR F REMONT P. LIYINGSTON BY ww@ ATTORNEY Patented May 3, 1927..

narran sra-rss rEEMoNr r. LIVINGs'roN, 0E nENvEE, coLon'A-no, AssIeNonfro THE wEsr'INGHoUsE AIE BRAKE COMPANY, or WILMERDING, PENNSYLVANIA, A CORPORATION' or f PENNSYLVANIA.

AppIication filed July 17,

This invention relates to retaining valve ilevices of the type employed on railway cars for retaining fluid under pressure 1n the brake cylinder.

The retaining valve device heretofore employed comprises a body portion containing a retaining valve, a coil spring act1ng on the retaining valve and a cap nut having screw-threaded engagement with the body portion and adapted to hold the spring under compression.

With this construction, when the cap nut is removed, in order to clean the valve seat and to permit regrinding of the valve seat, the spring is exposed and free and is sometimes stretched or compressed by the operator before it is replaced, thereby changing y the desired pressure value of the retainer.

The principal object of my invention is to provide a pressure retaining valve device, in which the valve is readily accessible for grinding and cleaning purposes, but in which the const-ruction is such that the spring cannot be easily tampered with.

In the accompanying drawing, the single figure is a central sectional view of a retaining valve device embodying my invention.

As shown in the drawing, the retaining valve device may comprise the usual body portion 1 having mounted therein a plug valve 2 adapted to be operated by a handle 3. The body portion is provided with a valve 'chamber 4, containing a retaining valve 5.

A barrel section 6 is -provided having screw-threaded engagement in the body portion. The valve 5 is provided with a stem 7 which extends through the bore of the barrel and has its end threaded to receive a nut 8. Within the barrel near the upper endan annular shoulder 9 is provided and interposed between said shoulder and .a collar carried by the valve 5, and surrounding the stem 7 is a coil spring 10. The nut 8 is provided with an annular guide portionV 11 which is guided in the bore of the barrel 6.

In order to assemble the parts, the stem l with the spring 10 placed in position, is inserted in the barrel 6 and is pushed upwardly, compressing the 'spring 10 against the shoulder 9 sufficiently to permit the nut 21.1 to be applied to the end of the stem, and

RETAINING-VALVE DEVICE.

1926. Serial No. 123,087.`

tartar ortica.

ings in the stem 7 and the nut 8 while the stem is held ina position above the end of the barrel and exposing said openings.V The valve 5 and its stem arethen released and the nut 11 is moved down by the spring 10, but its downward movement is limited by engagement with the shoulderl 9."

A cap nut 13 is then applied to the upper end of the barrel rand said barrel is ready to be screwed into thebody portion 1.

If it is desired to clean or inspect the seat of the valve 5, this may be done by unscrewing the barrel section 6, or the valve seat may be reground by merely removing the cap nut 13, so that the nut 8 may be rotated to rotate the valve 5 on its seat by means of the screw driver slot 14 which is provided on the nut 8.

If the barrel is removed, it will be seen that the spring 10 remains assembled with the barrel, so that the spring cannot be easily tampered with and the spring can only be removed by pushing up the valve stem 7 so as to permit the pin 12 to be driven out, and then the nut 8 may be unscrewed, permitting the stem 7 and the spring 10 to be disassembled.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a pressure retaining valve device, the combination with a valve body having a valve seat, of a barrel adapted to be secured to said body, a valve for engaging said seat, a stem carried by said valve and positioned in said barrel, a spring mounted in said barrel and acting on said valve, vand means for holding said stem in said barrel.

2. In a pressure retaining valve device, the combination with a valve body having a valve seat, of a barrel adapted to be secured to said body and having a spring chamber, a valve for engaging said seat, a stem carried by said valve and extending through said chamber, a nut having screw-threaded engagement with the end of said stem, a in for securing said nut to the stem, and) a spring mounted in said chamber and acting on said valve. Y

,3. 1n a pressure retaining valve device,- the combination with a valve body having valve seat and a valve Chamber, of a valve in said 611211161661' engaging said seat, a barrel having screw-threaded engagementwth said valve body,-a stem carried by said valve and extending through the bore of the barrel, a

:'ShOllldeI' withinV Athe bore of lthe barrel, a

@ring-interposedbetween said shoulder and said valve, a nut secured to the end of said stem, and a pin for securing Said nut to said stem.

`In testmonynwhereof .I have hereunto Set my hand.

FREMONT il?.V LIVINGSTON. 

